Fine pore formation agent for porous resin film and composition containing the same for porous resin film

a technology of porous resin and composition, which is applied in the direction of cell components, cellulosic plastic layered products, natural mineral layered products, etc., can solve the problems of limited thickness and the like of selectable resins and films for every application, and achieve high porosity, improve the capability of batteries, and high ventilation properties

Active Publication Date: 2009-01-29
MARUO CALCIUM COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037]Since the inorganic particles composing the fine pore formation agent for a porous film of the present invention scarcely contain coarse particles, the strength deterioration of the porous resin film hardly occurs and the distribution width of the void diameter of the porous film is made uniform and the void diameter can be controlled, and further, since conductive impurities are in an extremely little amount, in the case where the inorganic particles are added to a resin for a film, a porous resin film usable for uses as electric parts such as capacitors and battery separators can be obtained.
[0038]Hereinafter, the present invention will be described in more detail.
[0039]The formulas (a) and (b) are indexes for informing the dispersion state of the fine pore formation agent for a porous resin film of the present invention (hereinafter, simply referred to as a fine pore formation agent in some cases).
[0040]In the formula (a), it is required that the average particle diameter (D50) measured by micro-track FRA is in a range from 0.1 to 1.5 μm. It is possible to control the average particle diameter (D50) to be smaller than 0.1 μm in terms of a technique, however it is undesirable in terms of the cost. Further, if it exceeds 1.5 μm, the cohesive power of secondary particles, which are agglomerates of the primary particles, becomes high and the inorganic particles exist as being the s

Problems solved by technology

However, the insulating property, which is a function of the separator, and decrease of the inner resistance are contradictory and therefore they cannot be satisfied simply by making the separator thin, and it is required to give good size stability, wettability to an electrolytic solution, retention property, and corrosion resistance and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0110]A quick lime obtained by firing a gray and dense limestone in a fluidized bed type kiln using kerosene as a heat source was dissolved to obtain a slaked lime slurry and reaction with carbonic acid gas was carried out to synthesize calcium carbonate. A water slurry containing the calcium carbonate was sieved with a sieve (400 mesh) to remove foreign matter and coarse particles and thereafter, the resulting calcium carbonate slurry was subjected to particle growth by Ostwald aging to obtain a water slurry containing 10% of calcium carbonate with BET specific surface area of 12 m2 / g.

[0111]Next, the following surfactant (A) and chelating compound (B) in amounts of 3.5% and 1.2%, respectively, to the amount of the calcium carbonate solid matter, were used for surface treatment to obtain a slurry of surface treated calcium carbonate.

[0112]Thereafter, dewatering, drying, and pulverization treatments were carried out and the obtained dry powder was classified by an air classification ...

example 2

[0120]The same process as the process of Example 1 was carried out to obtain a slurry of calcium carbonate with BET specific surface area of 35 m2 / g and successively obtain surface treated calcium carbonate powder except that 1.0% of citric acid, which was a particle growth inhibitor to calcium hydroxide, was added in the synthesis of calcium carbonate by reaction of the slaked lime slurry and carbon dioxide gas, and that the addition amounts of the surfactant (A) and the chelating agent (B) were changed to 10% and 1.5%, respectively. The physical properties of the obtained surface treated calcium carbonate powder are shown in Table 1.

example 3

[0121]The same process as the process of Example 1 was carried out to obtain a surface treated calcium carbonate powder, except that the addition amounts of the surfactant (A) and the chelating agent (B) were changed to 6.0% and 1.5%, respectively. The physical properties of the obtained surface treated calcium carbonate powder are shown in Table 1.

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Abstract

A fine pore formation agent for a porous resin film is provided which comprises inorganic particles satisfying (a) 0.1≦D50≦1.5 (μm) (D50: average particle diameter of particles in 50% cumulative total by weight from the larger particle side by micro-track FRA), (b) Da≦20 (μm) (Da: maximum particle diameter by micro-track FRA), (c) 3≦Sw≦60 (m2/g) (Sw: BET specific surface area measured by nitrogen adsorption method), (d) Ir≦1.0×105 (Ω·cm) (Ir: volume resistivity (Ω·cm).
The fine pore formation agent for a porous resin film is capable of providing a resin composition giving a porous resin film useful in uses for electric parts such as capacitors and battery separators.

Description

TECHNICAL FIELD[0001]The present invention relates to a fine pore formation agent for a porous resin film and a composition containing the agent for a porous resin film. More particularly, the present invention relates to a fine pore formation agent for giving a porous resin film which is suitable for uses for electric parts such as capacitors and battery separators and a composition containing the fine pore formation agent for a porous resin film, since inorganic particles composing the fine pore formation agent for a porous film of the present invention scarcely contain coarse particles and thus prevent strength deterioration of the porous resin film, are capable of making the distribution width of the void diameter of the porous film uniform and controlling the void diameter, and contain an extremely small amount of conductive impurities.BACKGROUND ART[0002]A porous resin film made of a synthetic resin has been used as a filtration material for water purifiers, air purifiers and ...

Claims

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Application Information

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IPC IPC(8): C08J9/35B32B1/00H01M50/403H01M50/417
CPCC01B25/32C01F5/14C01F11/18C01F11/462Y10T428/2982C01P2004/62C01P2006/12H01M2/145H01M2/1653C01P2004/61Y02E60/10H01M50/403H01M50/417C08J9/00C08J5/18C08K3/10H01M50/411H01M50/446H01M50/491H01M50/443H01M50/431
Inventor NAGAMATSU, MAKOTOSHIMIZU, SEIYAKASAHARA, HIDEMITSUHOJO, HISAKAZU
Owner MARUO CALCIUM COMPANY
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